ASL
From Atomicorp Wiki
Using ASL 2.0
Quickstart Documentation
1) Update the signature database
asl -u
2) Run a report
asl -r
3) Read the App Inventory DB
less /var/asl/data/webapp.db
Understanding the Report
KERNEL Report Checking for ASL kernel: [FAILED] [HIGH RISK] # ASL kernel is not running, which means you are exposed to Buffer overrun attacks, no TPE, and no GRSEC ACL capability
General Settings Updatedb is enabled: [FAILED] [INFORMATIONAL] # updatedb is used for generating the locate database, this is not a security message. Checking for unnecessary services portmap is disabled: [FAILED] [LOW] nfslock is disabled: [OK] [LOW] rpcidmapd is disabled: [OK] [LOW] cups is disabled: [OK] [LOW] gpm is disabled: [FAILED] [LOW] xfs is disabled: [FAILED] [LOW] messagebus is disabled: [FAILED] [LOW] # These are all services turned on by default. The risk is low, because they are unnecessary services, rather than they are directly exploitable. Recommend that they be disabled.
Checking general settings for PSA /var/log/psa exists: [FAILED] [INFORMATIONAL] # This is a check for a shortcut to /usr/local/psa/var/log. This is not a security message.
Checking psmon settings # PSMON is a watchdog daemon, used to start services if they crash. It is used to monitor and restart services like denyhosts, ossec, etc. It can used to monitor any service however (apache, qmail, etc). # this module checks to ensure that psmon is configured as defined in /etc/asl/config Checking for psmon installation: [OK] [INFORMATIONAL] # is it installed Process monitoring enabled: [FAILED] [INFORMATIONAL] # is it set to start up. psmon ensures that other security components are running, in the event that they crash. Notifications to: root [OK] [INFORMATIONAL] # is it set to send notifications to your configured email address From line set to: psmon@cp8.foreststar.net [FAILED] [INFORMATIONAL] # is it set to send from the configured email address
Checking General ossec-hids settings
# OSSEC is a host based IDS, it monitors log files, detects file system changes as well as root kits, can shun attackers, and can combine data from multiple systems.
Checking for ossec-hids installation: [OK] [INFORMATIONAL]
# is it installed
OSSEC is configured in server mode [INFORMATIONAL]
# what mode is it in, client, server, or local
Checking for ossec-hids-server installation: [FAILED] [INFORMATIONAL]
# is the ossec-hids-server rpm installed
Enable email notification: [OK] [INFORMATIONAL]
# does it notify
Notifications to: root [FAILED] [INFORMATIONAL]
# who they go to (/etc/asl/config)
Notifications from: ossec@cp8.foreststar.net [FAILED] [INFORMATIONAL]
# From line (/etc/asl/config)
SMTP server set to: ac3.atomicorp.com [FAILED] [INFORMATIONAL]
# SMTP server it will use to send alerts (/etc/asl/config)
Client connections allowed through firewall: [OK] [INFORMATIONAL]
# Firewall rule check. Since this system is a server, it would need to be configured to allow those connections to it.
Shun period time set to: 600 [OK] [INFORMATIONAL]
# period to shun an attacker (/etc/asl/config)
Verifying OSSEC whitelists
# checks to see that whitelisted hosts are in the ossec configuration
checking 127.0.0.1: [OK] [INFORMATIONAL]
Checking local OSSEC settings for PSA # Checks to see that ossec is monitoring PSA logs Monitoring httpsd_access_log: [FAILED] [INFORMATIONAL] Monitoring httpsd_error_log: [FAILED] [INFORMATIONAL] # /usr/local/psa/admin/logs/httpsd_access_log and /usr/local/psa/admin/logs/httpsd_access_log/httpsd_error_log
Checking General rkhunter settings # rkhunter is a signature based rootkit hunter, this module checks basic rkhunter configuration. # it will email the notification contact nightly with a security report, if it detects anything suspicious # this module overlaps with OSSEC to some extent. Checking for rkhunter installation: [OK] [INFORMATIONAL] Notifications to: root [OK] [INFORMATIONAL] Enable ssh root login tests: [OK] [INFORMATIONAL] # Ensures that the Root Login test is enabled in rkhunter
Checking General httpd settings Verify .htacces AllowOverride not set to ALL: [OK]
Performing an inventory of web applications
Indexing applications: ...... Scanning applications:
Checking General mod_security settings
Checking for mod_security installation: [OK] ServerSignature set to: Apache [FAILED] SecUploadDir set to: /var/asl/data/suspicious [FAILED] SecUploadKeepFiles set to: RelevantOnly [FAILED] Logging set to: Serial [OK] Logfile set to: modsec_audit.log [OK] Logging elemets set to: ABIFHZ [OK] SecRequestBodyInMemoryLimit set to: 131072 [OK] SecDataDir set to: /var/asl/data/msa [FAILED] SecTmpDir set to: /tmp [OK]
Checking rule class settings HTTP Policy ruleset : on [OK] Bad Robots ruleset : on [OK] Generic Attacks ruleset : on [OK] Trojan detection ruleset : on [OK] Outbound rules : off [FAILED] Marketing ruleset : off [OK] Local ruleset : on [OK]
Checking General PHP settings
Checking for php installation: [OK] PHP Safe Mode Enabled: [FAILED] Register Globals Disabled: [OK]
Checking for High-Risk functions
Function dl disabled: [FAILED] Function exec disabled: [FAILED] Function furl_open disabled: [FAILED] Function furl_open disabled: [FAILED] Function leak disabled: [FAILED] Function passthru disabled: [FAILED] Function pfsockopen disabled: [FAILED] Function phpinfo disabled: [ALLOWED] Function popen disabled: [FAILED] Function posix_kill disabled: [FAILED] Function posix_mkfifo disabled: [FAILED] Function posix_setpgid disabled: [FAILED] Function posix_setsid disabled: [FAILED] Function posix_setuid disabled: [FAILED] Function proc_close disabled: [FAILED] Function proc_get_status disabled: [FAILED] Function proc_nice disabled: [FAILED] Function proc_open disabled: [FAILED] Function proc_open disabled: [FAILED] Function proc_terminate disabled: [FAILED] Function shell_exec disabled: [FAILED] Function show_source disabled: [FAILED] Function system disabled: [FAILED]
Checking PHP extensions /etc/php.ini /etc/php.d/imap.ini /etc/php.d/ldap.ini /etc/php.d/mysql.ini
Configuration
Currently the web interface is incomplete. ASL can be configured through /etc/asl/config, the following is a list of each setting and what it does:
# Authentication information CONFIGURED=yes # an internal setting, if its set to no you would (in theory) be forced through a configuration dialog USERNAME="USERNAME" PASSWORD="PASSWORD" UPDATEPATH="www.atomicorp.com/channels/asl-bleeding/rules/" # where the rule updater will grab updates ASLHOME="/var/asl" # internal variable, dont modify
# ASL general config NOTIFY=yes # used to determine if modules that can send email notifications, will do so. Setting this to: no, will disable ALL email based notifications EMAIL="scott@atomicrocketturtle.com" # a master email address, settings below will use the $EMAIL variable to assign this address. Can be overridden per app. ADMIN_USERS="SOMEUSER" # who your administrative users are, this is used by modules like SSH to harden the system. Its highly recommended to define admin users, separated by whitespace. # list of hosts separated by whitespace IP_WHITELIST="127.0.0.1 10.10.10.10 10.10.10.11 10.10.10.12" # IP's listed here will not be shunned by any of the IDS's (modsec, denyhosts, etc) # webserver, custom SYSTEM_TYPE="webserver" # webserver, or custom right now. Used by ossec, and some other modules. Use webserver only for now.
# Kernel config # Disable module_loading after the system has booted VSERVER=no # probably will be deprecated ALLOW_kmod_loading=no # ASL kernels can be set to disallow module loading to defend against kernel root kits. The default is to NOT allow module_loading after the system has booted.
# PSMOD config PSMON_ENABLED=yes # Turn PSMON and its checks On or Off PSMON_EMAIL="$EMAIL" # who to email PSMON alerts to PSMON_FROM="psmon@$HOSTNAME" # From: line for PSMON
# OSSEC config OSSEC_ENABLED=yes # Enable OSSEC OSSEC_MODE="server" # options are client, server, local. Servers can accept OSSEC events from clients. Local is a standalone OSSEC system. OSSEC_EMAIL="$EMAIL" # Where OSSEC email alerts go OSSEC_SMTP_SERVER="localhost" # System ossec sends email through OSSEC_FROM="ossec@$HOSTNAME" # From line for OSSEC alerts OSSEC_SHUN_ENABLE_TIMEOUT=yes # Enables expiration of OSSEC shunning events (see IP_WHITELIST above) OSSEC_SHUN_TIME="600" # Time a shunned host will remain on the blacklist (10 minutes)
# MODSECURITY config MODSEC_ENABLED=yes # Turn MOD_SECURITY and its checks on/off MODSEC_SERVERSIG="Apache" # The "signature" the system will present to clients. The default is to send a client versions of the software installed. This helps against recon attacks MODSEC_UPLOADDIR="/var/asl/data/suspicious" # Where suspicious uploaded files (POSTS) will be stored MODSEC_KEEPFILES="RelevantOnly" # Off, or RelevantOnly. Related to above, this tells the system to keep those files or not. MODSEC_LOG404=no # not used yet. Application default is to log 404 errors in mod_security logs. MODSEC_LOGTYPE="Serial" # Serial or Concurrent. Serial sets modsecurity to log all events to one log file. MODSEC_LOGFILE="modsec_audit.log" # The log file for above. MODSEC_LOGELEMENT="ABIFHZ" # Elements of an event that will be logged #A = audit log header (mandatory) #B = request headers #I = request body, except when multipart/form-data encoding is used #F = final response headers #H = audit log trailer #Z = final boundary (mandatory) MODSEC_REQMEMLIMIT="131072" # Maximum size of the request body to keep in memory, higher value requires more server memory, lower can impact disk I/O MODSEC_DEBUGLOG=yes # not used yet (on by default: modsec_debug.log) MODSEC_DATADIR="/var/asl/data/msa" # top level dir used for mod_security internals. Must be read/write by the apache user MODSEC_TMPDIR="/tmp" # Directory where temporary files are created
# Rule configuration starts here MODSEC_RULES_POLICY=on # enable/disable the HTTP Policy rules MODSEC_RULES_ROBOTS=on # enable/disable the Bad Robot ruls MODSEC_RULES_GENERIC=on # enable/disable generic attack rules MODSEC_RULES_TROJAN=on # enable/disable trojan detection rules MODSEC_RULES_OUTBOUND=off # enable/disable outbound rules (recommend this OFF for PSA environments) MODSEC_RULES_MARKETING=off # enable/disable marketing tracking rules (google, msn, yahoo bots) MODSEC_RULES_LOCAL=on # enable/disable local rules
# PHP Functions PHP_CHECKS=yes # (yes/no) enable/disable php checks PHP_SAFE_MODE=yes # (yes/no) enable safe_mode checks. Turning safe_mode off exposes you to a number of threats, including remote file inclusion ALLOW_dl=no # (yes/no) disables the dl() function. dl() would allow an attacker to load their own extension into php. ALLOW_exec=no # (yes/no) disables exec() function. exec() allows an attacker to execute shell commands through php ALLOW_leak=no # (yes/no) disables leak() function. ALLOW_passthru=no # (yes/no) disable passthru(). This function allows an attacker to execute shell commands through php ALLOW_pfsockopen=no # (yes/no) This function allows an attacker to open sockets, useful for spamming, remote inclusion, etc. ALLOW_phpinfo=yes # (yes/no) recon attack. Allowed by default in psa environments. phpinfo can expose internal information used by attackers ALLOW_popen=no # (yes/no) process open, allows attacker to execute commands on a system ALLOW_posix_kill=no # (yes/no) kill processes owned by the apache user ALLOW_posix_mkfifo=no # (yes/no) creates a special FIFO file which exists in the file system and acts as a bidirectional communication endpoint for processes ALLOW_posix_setpgid=no # (yes/no) Set process group id for job control ALLOW_posix_setsid=no # (yes/no) Make the current process a session leader ALLOW_posix_setuid=no # (yes/no) Set the UID of the current process. (Apache would have to run as root for this to work anyway) ALLOW_proc_close=no # Close a process opened by proc_open() ALLOW_proc_get_status=no # Get information about a process opened by proc_open() ALLOW_proc_nice=no # change nice level on process opened by proc_open ALLOW_proc_open=no # execute commands ALLOW_proc_terminate=no # kill processes started by proc_open() ALLOW_shell_exec=no # execute shell commands ALLOW_show_source=no # Alias of highlight_file(), lets you view a php file. Exposes passwords, vulnerability recon, etc. ALLOW_system=no # execute shell commands
# Denyhosts settings # uses EMAIL for notifications DENYHOSTS_ENABLED=yes DENYHOSTS_EMAIL="$EMAIL" DENYHOSTS_FROM="denyhosts@$HOSTNAME" DENYHOSTS_SYSLOG=yes DENYHOSTS_SHUN_TIME="4w"
# SSH ALLOW_ssh_proto1=no ALLOW_root_logins=no DISABLE_strict_mode=no DISABLE_ignore_rhosts=no DISABLE_pubkey_authentication=no ALLOW_password_authentication=no DISABLE_privilege_separation=no
# Rkhunter settings RKHUNTER_ENABLED=yes RKHUNTER_EMAIL=$EMAIL
